Abstract
The crystal structure of Rb2Mn3(H2O)2[P2O7]2, a new phase obtained in the form of single crystals under hydrothermal conditions in the MnCl2–Rb3PO4–H2O system, is determined by X-ray diffraction (Xcalibur-S-CCD diffractometer, R = 0.0270): a = 9.374(2), b = 8.367(2), c = 9.437(2) Å, ß = 99.12(2)°, space group P21/c, Z = 2, D x = 3.27 g/cm3. A correlation between the unit-cell parameters and the size of cations forming the crystal structures of isostructural A2M3(H2O)2[P2O7]2 diphosphates (A = K, NH4, Rb, or Na; M = Mn, Fe, Co, or Ni) is revealed. It is shown that, due to the topological similarity, the structures of diphosphates and orthophosphates of the farringtonite structural type can undergo mutual transformations.
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Original Russian Text © G.V. Kiriukhina, O.V. Yakubovich, O.V. Dimitrova, A.S. Volkov, 2016, published in Kristallografiya, 2016, Vol. 61, No. 5, pp. 774–781.
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Kiriukhina, G.V., Yakubovich, O.V., Dimitrova, O.V. et al. Crystal structure of Rb2Mn3(H2O)2[P2O7]2, a new representative of the family of hydrated diphosphates. Crystallogr. Rep. 61, 796–804 (2016). https://doi.org/10.1134/S1063774516050084
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DOI: https://doi.org/10.1134/S1063774516050084